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Does the Surface Structure of Oxide Affect the Strong Metal-Support Interaction with Platinum? Platinum on Fe3O4(001) vs Fe3O4(111)

MPS-Authors
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Zhang,  Ke
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Shaikhutdinov,  Shamil K.
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Freund,  Hans-Joachim
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Pt Fe3O4(100) ChemCatChem.pdf
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Citation

Zhang, K., Shaikhutdinov, S. K., & Freund, H.-J. (2015). Does the Surface Structure of Oxide Affect the Strong Metal-Support Interaction with Platinum? Platinum on Fe3O4(001) vs Fe3O4(111). ChemCatChem, 7(22), 3725-3730. doi:10.1002/cctc.201500328.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0027-C3C8-C
Abstract
We studied the structure and thermal stability of Pt deposited on a Fe3O4(0 0 1) thin film to make a comparison with the Pt/Fe3O4(1 1 1) system that shows a strong metal–support interaction (SMSI) through encapsulation. Pt adatoms interact strongly with the (√2×√2)R45°-reconstructed Fe3O4(0 0 1) surface and adsorb monoatomically on the “narrow” sites. Metal sintering sets in only above 700 K to result in cuboid Pt nanoparticles exposing primarily (1 0 0) and (1 1 0) facets. Concomitantly, CO adsorption on Pt is fully suppressed as a result of the SMSI. The results provided strong evidence that the Pt nanoparticles on Fe3O4(0 0 1) are encapsulated by an FeO(1 1 1) layer in the same manner as observed for hemispherical Pt particles on Fe3O4(1 1 1). The comparison suggests that the SMSI effect through encapsulation is insensitive to the surface structure of the oxide, although the latter strongly affects the particle morphology.